Dynamo-electric machines.



N 895323. EATENTED ANC. I8 1908.

o EAC. EEICT.

DINAN/IC ELECTRIC MACHINE.

APPLICATION FILED JULY 10, 1903.

2 SHEETS-SHEET 1.

` INVENTDR: Hem.) @C i Re JC.

'PATENTED AUG. 18, 1908. E. G. EEIST.

DYNAMO ELECTRIC MACHINE.

APPLICATION FII-ED JULY 10, 1903.

2 SHEETS-SHEET 2.

. hgh/ENTIER: Hemqlels.

WMM'

HENRY G. anis'r,

F SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC 'i COMPANY, A CORPORATION OF NEW YORK.

DYNAMO-ELECTRIC MACHINE.

'Specification of Letters Patent.

Patented Aug. 18, 1908.

Application iled July 10, 1903. Serial No. 164,960.

To-all whom it 'ma/y concern.'

:13e .it known that I, HENRY G. REIsT, a cltlzenof the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Ii provenients 1n Dynamo -Electric Machines, of which the following is a specification.

The general object of my present invention is to improve the construction and thereby the operation' of dynamo-electric machines.

\ Among the particular objects of my invention is the improvement in the construction of construction and arrange-ment by which of the rotary field member of a dynamo-electric machine to enable it to better withstand the stresses produced vwhen run at an eX- tremely high speed such as commonly occurs when such machines are directly connected to 'steam turbines or the like. .A

' My invention consists in various features the objects4 of my invention are attained.

The ivarious'i'eatuies of novelty which clnrracterize my invention will be pointed out in the' A claims annexed to and forming a part of this specification. i

For a better understanding of my invention, reference may be had to the accompanying drawings .in which I have illustrated .the rotating-field member of afl fname-electric machine embodying `,my invention.

Of the drawings, Figure 1 is a plan partly in section illustrating the general constructionof the field magnet; Fig. 2 is a sectional elevation', the right-hand portion of the'view Abeing taken on the line A A of Fig. 1 and the :left-'hand portion beingvtaken on the line B B of Fig. 1; Fig. 3 is' an elevation showing the two portions 4', having an elliptical cross section, connected by a web portion 5 (see Fig. 1,). The arms 3 'are provided at their outer `ends with undercut grooves 6.

The magnetic circuit of the field' member comprises an annular body or ring 7 provided with polar projections 8. Preferably the ring 7 and polar projections S arejormed of laminas of magnetic materiell In the preferred form of my invention, cach of the laminas. out oll which the ring and the main portion of the pole pieces are formed consists of a curved portion@ provided willi two outwardly extending Snbstantiall y rectangular radial polar portions 1f) and l1 and with two inwardly extending similar tenen portions 9. The polar portions 1()l and 1 1 differ from each other in the fact that the polar portion 1l is longer than t ic portion 10. The outer edge of thc portion. 111is curved substantially concentric with the of revolution of the field member. T he outer edge of the portion 10 is straight and at .right angles to the side edges of the portions. The tenons tl are separated by a distance sufficient to allow them to be placed in the grooves 6 carried by adjacent arms 3.

ln assembling the laminas, some of them are reversed with respect to others that is to say, the ionger portions l1 of some of the lamina: are interleaved with the shorter portions 1() of other lan'xinsc., lnv practice l prefer to assemble the-Vlaminai in sections 12', each section consisting of several lamina: 'which may or may not'bc riveted together. The lamina in each 'section` are similarly placed but alternate sections are reversed with respect to' each other. By this arrange-` ment each pole portion 8 `consists, of a plurality of alternate long and short portions l() and 11 and the body of the r`in r 7 between the pole portions consists of paralel arc shaped iortions separated by spaces 7 clearly shown 1nFig.2,

The pole portions 3 lare completed by inserting tip members 12 between the portions 11 at the end of the portions lf). Each tip member consiststof one Aor more, preferably more, similar' lamina: 12. The laminarI 12 have their outer edges curved and are of a width equal to thc dilicrcnce in the length of the portions l() and 11 but are of a length greater than the width of thc pontions l() and 11 so that portions 13 project beyond the body of the pole piece to form the pole tips. 'lhc pole tips thus 'formed have a comparatively high reluctance by reason of the spaces between adjacent end )ortions 13. This is advantageous as is wel. known to all those skilled in the art.

'Holes 14 are formed in the laminar; through which bolts or pms are passed to secure the assemblediv annum together. Register- `-sing loops or straps hooked over said projec tions. j

" 10. In a dynamo-electric machine, a magnetic .circuit comprising an annular ring prol,videdj'with polar projections7 said ring hav- 'ections, coils on said -polar projections and races-therefor extending between adjacent I `portions of adjacent coils and retaining devices therefor' passing through said spaces and secured in place by keys o r wedges which bear a ainst the inner periphery of the ring.

11.l n a dynamo-electric machine, a magf netic circuit comprising portions formed of alternate laminas and spaces, coil retaining devices, 'each of sald devlces having one portion passlng'mto one of said spaces and anv otherportion passing into another of said I spaces, and securing means forsaid coil retaining 'devices engaging the edges` of said I V, laminas.

12. In a dynamo-electric machine, a rotating field magnet comprising a ring provided "with outwardly extending polar pro ljections, coils on said 'polar projections, wedgeashaped pieces located between adjacent coils, and retaining members passing over said wedges, said retaining members being secured to said ring portion by devices engaging the inner periphery of said ring.

13'. In a field magnet, an annular mass of laminated material provided with outwardly j lextendin polepieces, said mass beingformed by assem ingjsimilar laminas each of which comprises two polar portionsand a connect- `ing portion, 'said laminas being assembled so thatv the )olar 'portions are solid and the ring portions etween the pole portions are cornspaces formed in it between the polar proposed of alternate spaces and laminations, and coil-retaining devices passing through said spaces. o

14. In a field magnet, an annular mass of magnetic material havin external pole piece extensions and formed with radial spaces between the pole pieces, and coil retaining devices, each ofjwhichhas a portion passing through one of said spaces and another por` tion passing through another of said spaces, said retaining' devices beingsecured in place by means en aging the inner, curved surface of said annu ar mass.

15. In a eld magnet, a ring provided with externally-projecting ole pieces, coil-securing members located etween adjacent pole pieces, and retaining devices therefor locked 1n place by devices engaging the inner periphery of the ring.

16. In a dynamo electric machine, a rotating field magnet comprising a ring provided with outwardly extending polar proj ections, coils on said polar projections, braces extending between adjacent sides of adjacent coils and retaining members therefor secured to the ring by devices engaging the inner periphery of said ring.

17. In a dynamo electric machine, a rotating field magnet comprising a ring provided with outwardly extending polar projections, coils on said polar projections, braces therefor extending between adjacent sides of adj acent coils, and securing devices for the braces in the form of straps or yokes looped about the braces and secured to the ring.

Inrwitness whereof, I have hereunto set my hand this 6th day of July; 1903. HENRY G. REIS'I.

Witnesses:

' BENJAMIN B. HULL,

HELEN ORFORD. 

